After combining nanomaterials with traditional coatings, the excellent properties of the nanomaterials themselves can be used to significantly improve the performance of the coatings, and various types of functional coatings can also be developed. At present, the nanoparticles used to prepare nanocomposite coatings are mainly some metal oxides (such as TiO2, Fe2O3, ZnO, ATO, etc.), specific nanometal powders (such as nanometer Ti, Cr, Nd, Al, Co, etc.) and inorganic salts class (such as CaCO3, etc.).